arch, base, dev, kern, sym: FreeBSD support

This adds support for FreeBSD/aarch64 FS and SE mode (basic set of syscalls only)

Committed by: Nilay Vaish <nilay@cs.wisc.edu>

1 files changed, 175 insertions, 0 deletions

diff --git a/src/arch/arm/freebsd/system.cc b/src/arch/arm/freebsd/system.cc
new file mode 100644
index 000000000..95e712e7a
--- /dev/null
+++ b/src/arch/arm/freebsd/system.cc
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * This software was developed by the University of Cambridge Computer
+ * Laboratory as part of the CTSRD Project, with support from the UK Higher
+ * Education Innovation Fund (HEIF).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "arch/arm/freebsd/system.hh"
+
+#include "arch/arm/isa_traits.hh"
+#include "arch/arm/utility.hh"
+#include "arch/generic/freebsd/threadinfo.hh"
+#include "base/loader/dtb_object.hh"
+#include "base/loader/object_file.hh"
+#include "base/loader/symtab.hh"
+#include "cpu/base.hh"
+#include "cpu/pc_event.hh"
+#include "cpu/thread_context.hh"
+#include "debug/Loader.hh"
+#include "kern/freebsd/events.hh"
+#include "mem/fs_translating_port_proxy.hh"
+#include "mem/physical.hh"
+#include "sim/stat_control.hh"
+
+using namespace ArmISA;
+using namespace FreeBSD;
+
+FreebsdArmSystem::FreebsdArmSystem(Params *p)
+    : GenericArmSystem(p), dumpStatsPCEventF(nullptr),
+      enableContextSwitchStatsDump(p->enable_context_switch_stats_dump),
+      taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr),
+      bootReleaseAddr(p->boot_release_addr)
+{
+    if (p->panic_on_panic) {
+        kernelPanicEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
+            "panic", "Kernel panic in simulated kernel");
+    } else {
+#ifndef NDEBUG
+        kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic");
+#endif
+    }
+
+    if (p->panic_on_oops) {
+        kernelOopsEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
+            "oops_exit", "Kernel oops in guest");
+    }
+
+    uDelaySkipEvent = addKernelFuncEvent<UDelayEvent>(
+        "DELAY", "DELAY", 1000, 0);
+}
+
+bool
+FreebsdArmSystem::adderBootUncacheable(Addr a)
+{
+
+    return false;
+}
+
+void
+FreebsdArmSystem::initState()
+{
+    // Moved from the constructor to here since it relies on the
+    // address map being resolved in the interconnect
+
+    // Call the initialisation of the super class
+    GenericArmSystem::initState();
+
+    // Load symbols at physical address, we might not want
+    // to do this permanently, for but early bootup work
+    // it is helpful.
+    if (params()->early_kernel_symbols) {
+        kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask);
+        kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask);
+    }
+
+    // Setup boot data structure
+    Addr addr = 0;
+
+    // Check if the kernel image has a symbol that tells us it supports
+    // device trees.
+    bool kernel_has_fdt_support =
+        kernelSymtab->findAddress("fdt_get_range", addr);
+    bool dtb_file_specified = params()->dtb_filename != "";
+
+    if (!dtb_file_specified)
+        fatal("dtb file is not specified\n");
+
+    if (!kernel_has_fdt_support)
+        fatal("kernel must have fdt support\n");
+
+    // Kernel supports flattened device tree and dtb file specified.
+    // Using Device Tree Blob to describe system configuration.
+    inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename,
+            params()->atags_addr + loadAddrOffset);
+
+    ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true);
+    if (!dtb_file) {
+        fatal("couldn't load DTB file: %s\n", params()->dtb_filename);
+    }
+
+    DtbObject *_dtb_file = dynamic_cast<DtbObject*>(dtb_file);
+
+    if (_dtb_file) {
+        if (!_dtb_file->addBootCmdLine(params()->boot_osflags.c_str(),
+                                       params()->boot_osflags.size())) {
+            warn("couldn't append bootargs to DTB file: %s\n",
+                 params()->dtb_filename);
+        }
+    } else {
+        warn("dtb_file cast failed; couldn't append bootargs "
+             "to DTB file: %s\n", params()->dtb_filename);
+    }
+
+    Addr ra = _dtb_file->findReleaseAddr();
+    if (ra)
+        bootReleaseAddr = ra & ~ULL(0x7F);
+
+    dtb_file->setTextBase(params()->atags_addr + loadAddrOffset);
+    dtb_file->loadSections(physProxy);
+    delete dtb_file;
+
+    // Kernel boot requirements to set up r0, r1 and r2 in ARMv7
+    for (int i = 0; i < threadContexts.size(); i++) {
+        threadContexts[i]->setIntReg(0, 0);
+        threadContexts[i]->setIntReg(1, params()->machine_type);
+        threadContexts[i]->setIntReg(2, params()->atags_addr + loadAddrOffset);
+    }
+}
+
+FreebsdArmSystem::~FreebsdArmSystem()
+{
+    if (uDelaySkipEvent)
+        delete uDelaySkipEvent;
+    if (constUDelaySkipEvent)
+        delete constUDelaySkipEvent;
+
+    if (dumpStatsPCEventF)
+        delete dumpStatsPCEventF;
+}
+
+FreebsdArmSystem *
+FreebsdArmSystemParams::create()
+{
+    return new FreebsdArmSystem(this);
+}
+
+void
+FreebsdArmSystem::startup()
+{
+}